Meiosis MEIOSIS and sexual life cycles.

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Meiosis And Sexual Life Cycle
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Presentation transcript:

Meiosis MEIOSIS and sexual life cycles

Sexual Reproduction (animals) Gamete Gamete Fertilization (n + n  2n) Mitosis produces subsequent somatic cells Meiosis (2n  n + n + n + n) Zygote Gametes

Meiosis I – homologous pairs separate Synapsis Homologous chromosomes form tetrads Chiasmata may result Paternal and maternal chromatids recombine (cross over)

Meiosis I – homologous pairs separate

Meiosis II –pairs separate

Independent Assortment Crossing Over Independent Assortment

Independent Assortment Crossing Over Independent Assortment

Summary Comparison

Animal Sexual Life Cycle MEIOSIS FERTILIZATION n 2n

Fungal/Protist Sexual Life Cycle MEIOSIS FERTILIZATION n 2n

Plant Sexual Life Cycle MEIOSIS FERTILIZATION 2n n

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